Gauge or instrument for measuring or testing mechanical work



L. TAYLOR Sept. 12,1944.

GAUGE OR INSTRUMENT FOR MEASURING QR TESTING MECHANICAL WORK Filed Feb. 26, 1943 6 Sheets-Sheet l S p 1944- L. TAYLOR 5 GAUGE OR INSTRUMENT FOR MEASURING OR TESTING MECHANICAL WORK Filed Feb. 26, 1943 6 Sheets-rSheet 2 HTTOf/VIK Sept. 12, 1944. TAYLOR 2,358,264

GAUGE OR INSTRUMENT FOR MEASURING OR TESTING MECHANICAL 'WORK V FM 7 Sept. 12, 1944. I TAYLOR v GAUGE OR INSTRUMENT FOR MEASURING TESTING MECHANICAL WORK Filed Feb. 26, l45 6 Sheets-Sheet 4 L. TAYLOR Sept. 12, 1944.

GAUGE OR INSTRUMENT FOR MEASURING OR TESTING MECHANICAL WORK 6 Sheets-Sheet 5 Filed Feb. 26, 1943 SIANM 1.. TAYLOR Sept. 12, 1944.

GAUGE OR INSTRUMENT FOR MEASURING OR TESTING MEGHANICAL WORK Filed Feb. 26, 1943 6 Sheets-Sheet 6 Ian/1M HTTQ/F/VEY the right.

periphery;

Patented Sept. 12, 1944 .JUNITED STATES PATENT o FlcE .GAUGEOR INSTRUMENT FOR MEASURING,

on TESTING MECHANICALWORK Leonard Taylonc'astleton, Rochdale, England Application February 26,1943, Serial No. 477,196

In Great Britain April 3, 1942 Claims. -(Cl. 33199)' This invention relates to gauges or instruments for measuring or testing the accuracy of mechanical work.

The instrument 'may be used for measuring or testing bores or interiors, or screw-threads in such, or the distance between desired parallel or other faces. Also by very slight modification in construction the instrument can be used for such are expensive and not well suited for general use by ordinary workmen'inworkshops. This invention provides simple, robust and inexpensive measuring or testing instruments for the uses stated and there is hereafter described the general principle of working andstructure of instruments for the piuposes mentioned.

The following detailed description makes reference to the accompanying drawings, wherein:

Fig. 1"is a front elevation of the instrument for use in internal testing or measuring.

Fig. 2 shows an end view of Fig. 1 looking from Fig.3 is a plan view of Fig. 1. r

Fig. 4 shows by a detached view one of the antifriction rollers having annular thread-like projections and the manner of mounting.

Fig. 5 shows an anti-friction roller with plain Fig. 6 is a front elevation of the slightly modified instrument for use in external testing or measuring. 7 g

Fig. 7 shows an end view of Fig. 6 looking from the right.

Fig. 8 is a plan view of Fig. 6.

Fig. 9 is a detail view indicating that the standL' ard dial gauge used with the instruments may, if

desired, be disposed in aposition at right-angles to that shown in Fig. 6. I

The instrument for the .purposes first-mentioned is now described, and, in this/there is'provided a turned spindle of some length marked 'a. This spindle a has a longitudinal key-way a running for a considerable part of its length, and a collar a is fixed at one end by a grub screw a the collar a having a radially projecting arm at with adjustable threadedstud a to be referred to later. A slidable headstock b is mounted on the spindle a and guided in suitable manner as geously floating rollers. One of such floating rollers (of which three are necessary as will be seen later) is shown to an enlarged scale by Fig. 4. Such anti-friction rollers are fashioned with annular thread-like projections and are free to move axially end-on against the action of delicate springs c c and the axles c for said antifriction rollers c, c can be detachably secured to the platform b in manner such as illustrated. Threaded studs 0 permit of ready removal of the anti-friction rollers. In case the thread-like pro jections c are not desired, the rollers may be plain surfaced or have a barrel shaped periphery as shown in Fig. 5 and marked o I Respecting the springs b housed in the slidable headstock b, these are adapted to co-operate with two turned plungers d d projecting into the bores in the slidable headstock .1). These plungers 11 d are carried by a central stop member or bracket d which has two wings or'arms; d 01 (providing thumb and finger grips)- and is t fixed on the turned spindle a. The platform b hereafter mentioned. This slidable headstock b r -is bored longitudinally at twoplaces 12 b to house two coiled springs b b the outer ends of the bores being closed by plugs b?! On the platiorm b of said slidable headstock b are mounted anti-friction devices, shown'herein as comprising 7 two anti-friction rollers c, c which are advantaof the slidable headstock b has fiatheaded" studs b screwed therein, theiheads of which rest and are slidable upon adjustable grub screws d screwed into the two, Wings or arms d d said devices serving to guide and ensure the slidable headstock moving in a straight translation.- Upon'a bracket arm I) of the slidable headstock b is'mounted an appropriate type of standard or known graduated gauge or amplifier, such as the gauge marked e having rotatable or settable dial e and rotatable pointer e and dial fixing screw e said gauge hereinafter" referred to, as ast'andard dial gauge, and such as will give readings plus or minus in thousandths of an inch or other- I wise. This standard dial gauge has a push spindle e pressed outwards bya spring all as known}. and the push spindle e is acted upon when pressed against the adjustable threaded stud a Opposed'to the slidable headstock b and slidable. uponthe turned spindle-a the. slot A of which is engaged by the reduced end of the g ub screw-f is a second headstock, the main bracket 1 of which carries on its platform I the third anti-friction roller 0 of the character before men-. tioned, and this main bracket 1 has'a locking screw f. The other component of the headstock J is a sliding sleeve. I which has a locking screw i and this slidingsleeve f is also mounted on the turned spindle a. It is interconnected with the main bracket 1. by a screw-threaded'spindle i which has a milled adjusting nut f The three anti-friction rollersare fashioned, if required, with annular threadengaging projections 3 0 (Fig. 4) or with plain peripheries as shown at 0? (Fig.5.. i

The three anti-friction rollers'are obviously intended to engage the bore or what is to be measured or tested at three points and radially with regard to their disposition.

One I A in one arm of the stand A, the other end engaging a removable .bush A in the other arm of the stand and being locked'by a threaded stud A The instrument can, if desired, be readily introduced into and withdrawn from the stand as isobviousi r 7 In using the instrument, mounted on the stand for example, to set same to and to gauge from a master template or reference ring as B, and with the push spindle e of the standard dial gauge e bearing on the adjustable threaded stud cf, the locking screws of the two elements 1, f are unscrewed, and the sliding sleeve element 1 is separated from the main bracket J by a slight distance. The main bracket f is moved such a distance as roughly suits the fit of the anti-friction rollers such as'c, to the internal diameter of the template B or master reference ring or gauge the workman'is dealing with. This means, the three anti-friction rollers c are-roughly set to the bore of template B. The next step, is to fix the locking screw i of the sliding sleeve element f of the second head-stock; This done, thenut f on the adjusting screw 'f is turned, which acts to draw to theleft the main bracket 1 of .said

spect to the template B. The slight movement of 3 as already mentioned.

The standard dial gauge e is shown mounted,

the turned spindle a will have afiectedthrough the push spindle e the position of the' pointer e n with respect to the graduations on the dial e of the standard dial gauge 6. The dial clamping screw e is released and the dial e turned so that same can be set to bring the zeromark on the dial to the positionassumed by the pointer.

The dial clamping screw 8 is dial thus set.

By pressing the spring-loaded slidable headstock 2) towards the fixed central bracket d, placactuated to fix the ing the thumb on a wing or arm d of the fixed moved, and the piece of work to be measured or tested can be dealt with and introduced intoposition by again pressingthe slidable headstock 1) towards the central bracket (1. On release of finger and thumb pressure upon the wings or arms 1)", 41*, the anti-frictionrollers 0 will fit in proper position in the work to be measured or tested, and the push spindle e encountering the threaded stud a will be influenced according to accuracy or inaccuracy of the piece of work being measured or tested. V I

If the tested work is accurate the pointer of standard dial gauge will turn to zero, or if inaccurate will indicate the amount of inaccuracy, plus or minus, in degrees in thousandths or otherwise according to the character of the graduations on the standard dial gauge.

If there are screw-threads oncthe anti-friction rollers c, then by the manner of mounting and screw-threads on the work will be engaged and accuracy or inaccuracy measured.

The instrument automatically centres itself when expanded in the bore or the like of the template or master gauge or of the work, and said instrument is operative with a vertical or horizontal disposition, as later mentioned.

It will be understood that the instrument can be taken out of and used without the stand should its use in such manner be better suited tocircumstances.

In the instrument for testing or gauging work externally, the arrangements are slightly modified, and the modified arrangement is illustrated by the Figs.6to 8.

7 There is a turned spindle a with keyway a and a slidable headstock b mounted thereon. This slidable'headstock b carries the arm a with adjustable threaded stud (1 and projectin wings or arms b". The turned spindle a also carries a spaced collar g fixed thereon as by a grub screw g said collar 9 having projecting wings or arms 9 Springs 12 are housed in bores in the slidable, headstock 17*, the bores closed at the inner ends of threaded plugs b, said springs acting on plungers 'd projecting from the inner face of the spaced collar g. When the wing or arm 12 is pressed by holding same and a wing or arm 9' betweenthumb and finger, the slidable headstock b moves end-on and the springs b are compressed. On the platform b 7 two of the anti-friction rollers c are shown as mounted, same having the annular thread-like projections and being capable of floating; or the anti-friction rollers may have a, plain periphery on the central bracket d fixed on the turned spindle a, and the end of its push spindle e bears on the adjustable threaded stud a To guide and support the platform I) and the slidable I headstock b threaded studs b and grub-screws d are shown, see particularly Figs. 6 and 7, and

- act in manner already described.

There is also provided a second or auxiliary headstock mounted on the turned spindle a and consisting of a main bracket f (with slot engaging grub screw f and sliding sleeve is similar to those already mentioned.

On the platform f of the main bracket f the third anti-friction-roller c is mounted in manner already described. If it is desired to vary the 7 gauge B is placed upon the platforms D, I.

This done, the loose headstock including main bracket ,1 and sliding sleeve f are moved to approximately set the anti-friction roller 0, or 0 as the case may be, to the exterior of the master template or gauge 3*. The slidingsleeve f is clamped by stud f and the milled nut f operated I to push inwards the main'bracket andadjust the aid of the aforementioned springs 0 0 the the anti-friction rollers to exact setting. The main bracket ,f is then clamped by the screw f As a consequence of all this, a slight pressure is put upon the springs b and the spindle e of the standard dial gauge e is acted upon by the threaded stud 11 and the pointer e infiuencedto some extent. This done, the locking screw e for the erence to Figs. 1, 2 and 3.

dial is unscrewed and the dial 'e turned to set to zero with respect to the pointer e Bypressing the wings or arms b" towards the wings or arms. between the thumb and fingers,

- such act further compresses or loads the springs b so that the anti-friction rollers are separated, allowing the master template or. gauge B to be removed. Thereafter, the work to be tested or measured can be applied to the platforms b f whilst the anti-friction rollers are separated. When the anti-friction rollers are released they I will bear upon the work, and the reading can ,be

taken from the graduations on the standard dial gauge e which will indicate the accuracy or the degree of inaccuracy, plus or minus.

The instrument just described may, as already mentioned, be used supported by astand as shown by the Figs. 6, '7 and 8, or same maybe taken from the stand and used in connection with templates or gauges and the work, and detachment is effected in manner already described with ref- In using the aforesaid instrument, it is generally most convenient to dispose the dial of the second headstock thereby to permit engagement and disengagement of the roller from the work 7 mounting arrangements which permit the standard dial gauge to be turned through 90.. 7 the shank e of said standard dial gaugeis fixed by a threaded stud d to the pendent support d using an intervening loose block d", the threaded stud 116' being vertically disposed. Attachment in this way gives a vertical disposition of the standarddial gauge (see Figs. 6 and 7)., If a In Fig. 7

horizontal disposition is desired, as for example when using the detached instrument in an inverted position, then the threaded stud d is removed, detaching the aforesaid gauge and the loose block d"- The loose block d is then disposed on the inner face of the pendent support d*, and the aforesaid gauge is turned through 90 and its shank e abutted on the aforesaid differently disposed block d and the threaded stud (i screwed into a threaded transverse bore (1' in the pendent support (1 the result being the horizontal disposition indicated at Fig, -9. It will be seen, that this disposition of the push spindle e still coincides with the centre line of the adjustable threaded stud .a against which the push spindle operates, and a broken part of the pendent bracket a is indicated in broken lines in Fig. 9. Similar mounting arrangements'to change the disposition of the standard dial gauge can be provided with respect to the instrument shown at Figs. 1 to 3, the means just described for such purpose being indicated by Fig. 2, and it is unnecessary to repeat the description.

The mechanism and structure of the described instruments is robust and they are therefore Well for sliding movement on said spindle, a stop member secured on the spindle in spaced relation. to said headstock, cooperating means carried by said stop member, and headstock for guiding the latterrin its sliding ;movement on the spindle, a pair ofrollers mountedon said headstock, a second headstock slidably mounted on the spindle and having means for securing it at any desired point on said spindle, a third:

roller carried by said second headstock in position to cooperate with said pair of rollers for engaging the work to be measured, a measuring gauge supported on an arm depending from one of the members mounted on the spindle," and means carried on the pindle and cooperating with means carried by said gaugetotransmit movement of the slidable headstock to said gauge, said slidable headstock and stop'member having portions manually engageable for moving the sliding headstock with relation to the to be measured.

2. An instrument as set forth in claim 1, the

slidable headstockhaving apair of longitudinally extending openings therein, cushioning springs disposed insaid openings, and plungers carried by said stop member and extending into said openings thereby to compress said springs when the.slidable headstock is moved toward the stop member. I

T 3. An instrument as set forth in claim 1, the cooperating means for transmitting movement of the slidable headstock to the gauge compris-- ing, an arm extending radially from'the spindle and a spring cushioned push rod extending from.

said gauge in position to abut against said arm thereby to operate the gauge in response to the sliding movement of the headstock.

4. An instrument as set forth in claim 1, including a member secured on' said spindle and having means in engagement with said second headstock for adjusting the same to the desired position on the spindle.

5. An instrument for measuring mechanical work, comprising a supporting stand, a spindle removably secured at its opposite ends in said stand, a headstock mounted for sliding movement on said spindle, a stop member secured on the spindle in spaced relation to said headstock cooperating means carried by said stop member and headstock for guiding the latter in its sliding movement, said slidable headstock having a pair of longitudinally extending openings therein, cushioning springs disposed in. said openings, plungers carried by said stop member and extending into said openings thereby tocomstock slidably mounted on the spindle and havingmeans for securing it at any desired point on said. spindle, cooperating 'means carried by said headstocks for engagingthe work 'to be measured, an arm depending from said stop member, a measuring gauge supported on said arm and having a'springcushioned push rod extending therefrom, an 'arm depending from said first headstock into position to engage said push rod thereby to operate the same and transmit movement of the headstock to said gauge, .a member secured on said spindle and having means in engagement with the second headstock J i for adjusting the latter longitudinally or the spindle, and manually engageable means carried by the stop member and first headstock for moving the latter with relation to the second headstock thereby to permit engagement and disengagement of saidWork-engaging means.v

LEONARD TAYLOR. 

